Over the years, I've written a number of long emails to folks in GMail, and in some of them I think there were some interesting ideas I'd like to go back and look at and possibly do something with.

What I'd like to do is view all of my "sent mails" in GMail which are reasonably lengthy- at least 500 words (not including quoting of previous emails in the chain) This would at least help me separate out the interesting in-depth mails from the far more numerous shorter ones.

Is there any way I can do this with the mail stored in my GMail account?

Even when you can search for size, in outlook for example, it is based on the size of the entire email, not the number of words in the text. Any attachments will mask the size of the text. I see no easy way to do this based on the number of words in the text of a reply.
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mhoran_psprepJun 4 '12 at 10:39

And even discounting attachments, it would still prioritize mails where long prior threads are quoted. It's looking like the only way to do this will be to write a custom script...
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AscendantJun 7 '12 at 7:48